CN104030517B - The advanced treatment recovery process of coking chemical waste water - Google Patents

The advanced treatment recovery process of coking chemical waste water Download PDF

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CN104030517B
CN104030517B CN201310072129.9A CN201310072129A CN104030517B CN 104030517 B CN104030517 B CN 104030517B CN 201310072129 A CN201310072129 A CN 201310072129A CN 104030517 B CN104030517 B CN 104030517B
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membrane
reverse osmosis
water
pump
film
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CN104030517A (en
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申雅维
齐唯
葛文越
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SHANGHAI KAIXIN ISOLATION TECHNOLOGY CO., LTD.
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Shanghai Kai Xin Isolation Technique Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124Water desalination
    • Y02A20/131Reverse-osmosis

Abstract

A kind of advanced treatment recovery process of coking chemical waste water, comprise order carry out oil removal by air bubbling pre-treatment, acidification, denitrification process, biochemical degradation process, also comprise following subsequent step: A, by the waste water inorganic membrane filtration device process through biochemical degradation process, a membrane filtration liquid part can be used as ore-dressing technique Water circulation, and another part enters anti-pollution reverse osmosis membrane apparatus and carries out desalting treatment; B, steps A gained membrane filtration liquid pump is entered anti-pollution reverse osmosis membrane apparatus carry out desalting treatment, remove COD, NH in water further 3-N and inorganic salt, permeate is directly as circulating cooling Water circulation.The present invention adopts mineral membrane as the pre-treatment of reverse osmosis, ultra-filtration membrane not anti-pollution can be solved, the difficult problem that easy dirt is stifled, can not add due to mineral membrane charging or add flocculation agent less, the pollution level of reverse osmosis is made to reduce, thus extend the cleaning interval of RO film, and good with seasonal cleaning performance, avoid RO film that irreversible dirt occurs and block up.

Description

The advanced treatment recovery process of coking chemical waste water
Technical field
The present invention relates to Chemical Manufacture, particularly relate to a kind of advanced treatment recovery process of coking chemical waste water.
Background technology
Coking chemical waste water mainly from coking produce in the high temperature carbonization of coal and the treating process of gas purification and Chemicals, wherein with the remained ammonia produced in ammonia still process process for main source.The water yield, the water quality of coking chemical waste water are different because the scale of coking production, the gas purification process of employing and the degree of depth to Chemicals processing differ.But Jiao that water yield average out to often produces 1 ton about produces 1.18 ~ 1.83 tons of waste water.The quantity discharged of the annual coking chemical waste water in the whole nation is about 300,000,000 tons.Coking chemical waste water water quality is complicated, and the water yield is comparatively large, and is poisonous, harmful, high pollution, unmanageable trade effluent.Such waste water can be processed, and realize reuse, no matter all have great benefit to manufacturing enterprise or for society.
The main Problems existing of China's Treatment of Coking Effluent has: some small-sized coke-oven plants also do not build sewage treatment facility; Most disposal of coking plant waste water is not up to standard.The domestic coking chemical waste water overwhelming majority adopts Aerobic biological process method, in recent years due to the raising of environmental requirement, particularly have higher requirement to ammonia nitrogen emission concentration in waste water, conventional treating coking wastewater biologically, water outlet ammonia nitrogen does not generally reach emission request.A/O or SBR type denitrification treatment process poor impact resistance, Treatment of Coking Effluent becomes a great problem of iron and steel enterprise.Develop more efficient treatment process and become the trend developed in recent years.Coking chemical waste water wastewater flow rate is large, and difficulty of governance is large, and how the reuse solution of economy, reasonable design coking chemical waste water, is that coal chemical enterprise adapts to green circulation economy and builds a resource-conserving society the inevitable requirement further developed.
Organism in coking chemical waste water, based on phenolic compound, accounts for the over half of total organic matter.Polycyclc aromatic compound and nitrogenous, oxygen, sulphur heterogeneous ring compound etc. is also comprised in organism.Inorganic pollutant is mainly based on prussiate, thiocyanide, sulfide ammonium salt etc.Wherein distilled ammonia wastewater is that in coking chemical waste water, concentration is the highest, the waste water that intractability is maximum, belongs to the high-concentration organic industrial waste water of difficult degradation.
Conventional processes all, after coking chemical waste water and sanitary sewage or other lower concentration processing wastewater mixed dilutings, carries out biochemical treatment, qualified discharge together.
The coking chemical waste water water quality difference of each coke-oven plant is comparatively large, and after ammonia still process process, COD concentration is general still between 2000-5000mg/L, have still up to 10000mg/L.NH in ammonia still process processed waste water 4-N concentration at about 300mg/L, have even up to more than 1000mg/L.
By simple biochemical technology Treatment of Wastewater in Coking, water outlet is difficult to up to standard.The measure of materialization advanced treatment is have employed after some producer's biochemical treatment, wherein based on coagulating sedimentation, in order to make water outlet water quality reaching standard, need to add a large amount of medicament, make processing cost very high, Ye You minority producer adopts the high cost materialization technology such as filtration, zeolite and gac.
The process of above-mentioned waste water is all that this just causes the waste of water resources for the purpose of discharging.The developing direction in current Treatment of Coking Effluent field is that power consumption is low, cost is low, dosing is few, stable, can reuse, the water resources that practices every conceivable frugality novel process.
Coking wastewater deep treatment should process large amount of organic, oil, suspended substance in water, takes into account salinity, hardness, basicity and the muriate etc. removed in water simultaneously.If these impurity treatment are improper, be back to recirculated cooling water and can make cooling tower blocking, fouling, corrosion, also can accelerate microbial reproduction, outer row then can cause larger pollution.The technology of coking wastewater deep treatment can be divided into 4 kinds by handling principle both at home and abroad at present:
Physical, chemical method, physico-chemical processes and biochemical process.
The emphasis of Physical removes mineral substance in waste water and most of suspended solid, oils etc., comprises filtration method, membrane separation process etc.
Filtration method is by establishing perforated device or the filtering layer by being made up of certain medium by coking chemical waste water, suspended substance in sewage is removed, mainly utilize the effects such as the damming of granule medium, inertial impaction, screening, surface adhesion, by suspended substance removal in water.General filter device therefor has pressure type and gravity type boat davit two kinds, and what current wastewater treatment in China strainer generally adopted is pressure type, such as quartz filter, filter with multi-layer filter material, fiber filtering strainer etc.
Membrane separation process utilizes the selective penetrated property of film to carry out the method for isolation andpurification to waste water.
Membrane bioreactor (MBR) method is a kind of New Technology about Wastewater Treatment grown up the nineties in 20th century, is a kind of high-efficiency sewage treatment process combined with membrane separation technique of carrying out a biological disposal upon.This technology membrane separation technique replaces second pond and the conventional filtration unit of conventional contacts oxidation style, the high efficient solid and liquid separation ability of film makes effluent quality excellent, suspended substance and turbidity are close to zero, and can the contaminants of biological origin such as intestinal bacteria be retained, after process, water outlet can direct reuse, is particularly useful for sewage disposal.Current domestic coking wastewater deep treatment engineering is at the early-stage, and the technical process that several built coking wastewater deep treatment engineering adopts as Tianjin coke-oven plant is: biochemical outputted aerobic water one MBR mono-reverse osmosis; The technical process that Xinjiang coke-oven plant adopts is: biochemical outputted aerobic water one coagulation reaction tank one coagulative precipitation tank one BAF one ultrafiltration one reverse osmosis process.Above-mentioned two adopt the engineering built up from running condition, adopt the project effluent quality of membrane technique substantially can reach requirement.But these adopt the engineering of membrane techniquies also to there is many problems, and subject matter has: MBR fouling membrane is relatively more serious, flux depression than very fast, BAF treatment effect is not obvious, reverse osmosis membrane damage ratio compared with serious, matting is relatively more frequent, reverse osmosis concentration output of fluid is large, discharge easy contaminate environment etc.Analyze its reason, several built engineering exists that above problem mainly determines by the characteristic of coking chemical waste water.Coking chemical waste water is not only containing toxic organicses such as a large amount of ammonia, cyanogen and phenol, and biodegradability is poor, also containing a large amount of oil; Hardness, salinity, chlorion equal size are also higher.Even through coking chemical waste water that is biochemical and coagulating kinetics qualified discharge, organism, suspended substance, hardness, salinity and wet goods index are still higher.So adopt outputted aerobic water to enter MBR membrane module and easily cause oil, organism to the pollution of MBR film silk, and not easy cleaning.After the unit pre-treatment such as ultrafiltration, feed water by reverse osmosis CODc, content is still at 100 ~ 150mg/L, and comparatively serious to reverse osmosis membrane damage ratio, matting is more frequent.
Summary of the invention
Object of the present invention, exactly in order to solve above-mentioned prior art Problems existing, provides a kind of advanced treatment recovery process of coking chemical waste water.
In order to achieve the above object, present invention employs following technical scheme: discharge enters the coking chemical waste water of Sewage treatment systems successively after oil removal by air bubbling, hydrolysis acidification pool acidification, the process of anoxic pond denitrification, the process of Aerobic Pond biochemical degradation, extremely processed with in inorganic membrane filtration device through pump delivery by waste water through the process of Aerobic Pond biochemical degradation, film trapped substance is active sludge intermixture; A membrane filtration liquid part can be used as ore-dressing technique Water circulation, and another part enters anti-pollution reverse osmosis membrane apparatus and carries out desalting treatment; Active sludge intermixture is back to anoxic pond and carries out denitrification process.
The membrane filtration liquid pump of inorganic membrane filtration device enters anti-pollution reverse osmosis membrane apparatus and carries out desalting treatment, removes COD, NH in water further 3-N and inorganic salt, permeate is directly as circulating cooling Water circulation, and a membrane concentration liquid part is used as technique reuse water, and a part of circular treatment, remains a small amount of concentrated water discharge.
Inorganic membrane filtration device comprises film pump sump, fresh feed pump, recycle pump, film separation unit and sludge pump, each equipment is connected by pipeline, film pump sump receives the sewage from Aerobic Pond, the sewage of film pump sump enters film separation unit through fresh feed pump and recycle pump, membrane filtration liquid enters anti-pollution reverse osmosis membrane apparatus and processes further, and trapped active sludge intermixture is then got back to anoxic pond and carried out denitrification process.Get back to the control of reflux ratio of the mud that anoxic pond processes further at 0.2-9.
Film separation unit comprises multiple separatory membrane group, the sewage of film pump sump enters the first separatory membrane group through fresh feed pump and recycle pump, the concentrated solution of the first separatory membrane group enters the second separatory membrane group, the concentrated solution of the second separatory membrane group enters the 3rd separatory membrane group, the rest may be inferred, and anoxic pond got back to by the concentrated solution of last group separatory membrane group; The membrane filtration liquid of each separatory membrane group then merges and enters anti-pollution reverse osmosis membrane apparatus, or directly as rudimentary Water circulation.
The pore size filter of mineral membrane controls at 5nm-500nm, and membrane element is tubular type or plank frame, enters film pressure and controls at 1-20kg/cm 2, membrane pressure-controlling is at 0.1-19kg/cm 2, film surface velocity controls at 1-5m/s.
The material of mineral membrane is selected from aluminium sesquioxide, zirconium dioxide, titanium dioxide, stainless steel, alloy, nickelalloy or silicon carbide.
Anti-pollution reverse osmosis membrane is to the interception capacity of sodium-chlor more than 98%, and working pressure controls at 7-40kg/cm 2.Water Sproading rate controls at 50-90%.Preferably water rate of recovery 65-80%.
Anti-pollution reverse osmosis membrane apparatus comprises feed water by reverse osmosis pump, reverse osmosis charge filter, reverse osmosis high-pressure pump and reverse osmosis units, each equipment is connected by pipeline, the membrane filtration liquid come from inorganic membrane filtration device enters reverse osmosis units through feed water by reverse osmosis pump, reverse osmosis charge filter and reverse osmosis high-pressure pump successively, after reverse-osmosis treated, permeate is directly as circulating cooling Water circulation, a membrane concentration liquid part is used as technique reuse water, a part turns back to equalizing tank circular treatment, remains a small amount of concentrated water discharge.
The present invention adopts mineral membrane as the pre-treatment of reverse osmosis, ultra-filtration membrane not anti-pollution can be solved, the difficult problem that easy dirt is stifled, can not add due to mineral membrane charging or add flocculation agent less, the pollution level of reverse osmosis is made to reduce, thus extend the cleaning interval of RO film, and good with seasonal cleaning performance, avoid RO film that irreversible dirt occurs and block up.
Mineral membrane efficiently solves the separation problem of active sludge simultaneously, and mud is got back in biochemical system, and in biochemistry pool, sludge concentration can significantly improve, thus effectively reduces water outlet ammonia nitrogen concentration.The water outlet of film, again through special anti-pollution reverse osmosis technology, realizes coking chemical waste water and recycles.
The advantage and disadvantage of the advanced treatment recovery process of coking chemical waste water of the present invention is embodied in the following aspects:
1, the invention solves traditional aerobic activated sludge treatment process and occur sludge bulking phenomenon when high sludge loading runs, make muddy water be difficult to be separated, thus cause the difficult problem that system can not normally be run, water outlet is not up to standard.
The activated sludge concentration of 2, traditional activated sludge process is generally at 3000 ~ 5000mg/L, and the activated sludge concentration of this technique can reach 8000 ~ 12000mg/L.
3, realize muddy water by membranous system to be directly separated, do not need biochemical sedimentation basin, without the need to adding any chemical agent, improving mud-water separation efficiency, effectively reducing the pollution of RO, thus realizing the continuous and steady operation of RO.
4, greatly reduce floor space and construction investment, its civil engineering is taken up an area and is about 1/3 of traditional technology.
5, film can retain nearly all microorganism, especially for being difficult to that precipitate, that rate of propagation is slow microorganism, therefore intrasystem biophase extreme enrichment, the process of activated sludge acclimatization, increment shortens greatly, the degree of depth and the shock proof ability of system of process are strengthened, and water quality treatment is stablized.
6, system is conducive to breeding the retaining of nitrobacteria slowly, Growth and reproduction, and system nitrification efficiency is improved.
7, membrane sepn makes the macromole difficult degradation composition in sewage, has enough residence time, substantially increase the degradation efficiency of hardly degraded organic substance in the bio-reactor of finite volume.Reactor runs under age at high volumetric loading, low sludge loading, long mud, can realize basic discharged without residual mud.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is the process flow diagram of the inorganic membrane filtration device in the present invention;
Fig. 3 is the process flow diagram of the anti-pollution reverse osmosis membrane apparatus in the present invention.
Embodiment
See Fig. 1, the technique of the advanced treatment recovery process of coking chemical waste water of the present invention, comprises the step such as oil removal by air bubbling pre-treatment, hydrolysis acidification pool acidification, the process of anoxic pond denitrification, the process of Aerobic Pond biochemical degradation, inorganic membrane filtration device mud-water separation and anti-pollution reverse osmosis membrane apparatus desalting treatment that order is carried out.
Coordinate see Fig. 2, coking chemical waste water, after the process of Aerobic Pond biochemical degradation, is pumped in inorganic membrane filtration device and processes, and film trapped substance is active sludge intermixture; A membrane filtration liquid part can be used as ore-dressing technique Water circulation, and another part enters anti-pollution reverse osmosis membrane apparatus and carries out desalting treatment; The active sludge intermixture other anoxic pond that refluxes carries out denitrification process.
The membrane filtration liquid pump of inorganic membrane filtration device enters anti-pollution reverse osmosis membrane apparatus and carries out desalting treatment, removes COD, NH in water further 3-N and inorganic salt, permeate is directly as circulating cooling Water circulation, and a membrane concentration liquid part is used as technique reuse water, and a part of circular treatment, remains a small amount of concentrated water discharge.
Inorganic membrane filtration device comprises film pump sump, fresh feed pump, recycle pump, film separation unit and sludge pump, each equipment is connected by pipeline, film pump sump receives the sewage from Aerobic Pond, the sewage of film pump sump enters film separation unit through fresh feed pump and recycle pump, membrane filtration liquid enters anti-pollution reverse osmosis membrane apparatus and processes further, and trapped active sludge intermixture is then got back to anoxic pond and carried out denitrification process.Get back to the control of reflux ratio of the mud that anoxic pond processes further at 0.2-9.
Film separation unit comprises multiple separatory membrane group, the sewage of film pump sump enters the first separatory membrane group through fresh feed pump and recycle pump, the concentrated solution of the first separatory membrane group enters the second separatory membrane group, the concentrated solution of the second separatory membrane group enters the 3rd separatory membrane group, the rest may be inferred, and anoxic pond got back to by the concentrated solution of last group separatory membrane group; The membrane filtration liquid of each separatory membrane group then merges and enters anti-pollution reverse osmosis membrane apparatus, or directly as rudimentary Water circulation.
The pore size filter of mineral membrane controls at 5nm-500nm, and membrane element is tubular type or plank frame, enters film pressure and controls at 1-20kg/cm 2, membrane pressure-controlling is at 0.1-19kg/cm 2, film surface velocity controls at 1-5m/s.
The material of mineral membrane is selected from aluminium sesquioxide, zirconium dioxide, titanium dioxide, stainless steel, alloy, nickelalloy or silicon carbide.
Inorganic membrane filtration device in the present invention can design and return the system of washing.Adopt square impact combination to return in operational process to wash, extend the cleaning interval of film, improve the stability that film runs.
Coordinate see Fig. 3, anti-pollution reverse osmosis membrane apparatus in the present invention comprises feed water by reverse osmosis pump, reverse osmosis charge filter, reverse osmosis high-pressure pump and reverse osmosis units, each equipment is connected by pipeline, the membrane filtration liquid come from inorganic membrane filtration device enters reverse osmosis units through feed water by reverse osmosis pump, reverse osmosis charge filter and reverse osmosis high-pressure pump successively, after reverse-osmosis treated, permeate is directly as circulating cooling Water circulation, a membrane concentration liquid part is used as technique reuse water, a part turns back to equalizing tank circular treatment, remains a small amount of concentrated water discharge.Anti-pollution reverse osmosis membrane is to the interception capacity of sodium-chlor more than 98%, and working pressure controls at 7-40kg/cm 2.Water Sproading rate controls at 50-90%.Preferably water rate of recovery 65-80%.
Reverse osmosis units in the present invention is composed in series by multistage reverse osmosis equipment, adopts mode concentrated step by step in order to improve the reuse yield of water; In this reverse osmosis equipment, the concentrated solution of the preceding paragraph reverse osmosis membrane enters the process of hypomere reverse osmosis concentration, proposes contracting step by step, and last concentrated solution discharging is to concentrated solution transfer tank.The filtrate of each section of reverse osmosis membrane equipment gathers centralized collection and produces water as RO, and this RO product water can be used as water of productive use and carries out reuse.
A whole set of anti-pollution reverse osmosis membrane apparatus adopts continuously feeding, the mode of continuous discharge is run.In operational process, arbitrary section of (group) reverse osmosis equipment in system can stop cleaning separately, and not affecting other respectively organizes continuous and steady operation simultaneously, and keeping system processing power is constant.
The water outlet of inorganic membrane filtration device is recycled pump and gives higher flow velocity in anti-pollution reverse osmosis membrane apparatus, reciprocation cycle in film system, multi-cycle separation process is carried out piecemeal, often intersegmental concentrated solution step by step concentration, final stage reverse osmosis membrane group concentrated solution out directly drains into concentrated solution transfer tank and unifies wastewater treatment by owner, the filtrate of every intersegmental reverse osmosis membrane gathers and is collected together, as the reverse osmosis produced water of whole system, process is distributed unitedly by owner, as water of productive use reuse after collection.
Technique of the present invention is further illustrated below by specific embodiment.
Embodiment 1
Certain steel mill is through the coking chemical waste water 180L of biochemical treatment.In the circulation tank of this waste water 180L impouring ceramic membrane pilot plant, start recycle pump, control at 2.0/1.3kg/cm in turnover film pressure 2, start under room temperature condition to filter.As filtrate 157.5L, concentrated solution reaches equipment minimum liquid level, and filter and stop, now cycles of concentration reaches 8 times.Ceramic membrane filtrate 145L, in the batch can of reverse osmosis, starts in RO recycle pump, working pressure 15/14kg/cm 2, start under room temperature to filter.Collect filtrate 109L.Water Sproading rate 75%.
Water quality detection result is as shown in table 1:
Table 1
Embodiment 2:
The former water of certain steel mill's coking chemical waste water, after oil removal by air bubbling, after acidication process, enters anaerobic pond, anoxic pond, Aerobic Pond successively.Biochemical Aerobic Pond water outlet is inserted in film water inlet tank, and resemble through charging and deliver the water membranous system, this waste water provides film surface velocity under the driving of recycle pump.Turnover film pressure controls at 2.0/1.3kg/cm2, starts to filter under room temperature condition.Concentrated solution turns back in anoxic pond and controls reflux ratio is 5.Filtrate in the batch can of reverse osmosis, recycle-water.Water Sproading rate 75%.

Claims (6)

1. an advanced treatment recovery process for coking chemical waste water, comprise order carry out oil removal by air bubbling pre-treatment, hydrolysis acidification pool acidification, the process of anoxic pond denitrification, the process of Aerobic Pond biochemical degradation, it is characterized in that: also comprise following subsequent step:
A, inorganic membrane filtration device mud-water separation;
By the waste water inorganic membrane filtration device process through the process of Aerobic Pond biochemical degradation, film trapped substance is active sludge intermixture; A membrane filtration liquid part is as ore-dressing technique Water circulation, and another part enters anti-pollution reverse osmosis membrane apparatus and carries out desalting treatment; Active sludge intermixture is back to anoxic pond and carries out denitrification process;
B, anti-pollution reverse osmosis membrane apparatus desalting treatment;
Steps A gained membrane filtration liquid pump is entered anti-pollution reverse osmosis membrane apparatus and carries out desalting treatment, remove COD, NH in water further 3-N and inorganic salt, permeate is directly as circulating cooling Water circulation, and a membrane concentration liquid part is used as technique reuse water, and a part of circular treatment, remains a small amount of concentrated water discharge;
Described inorganic membrane filtration device comprises film pump sump, fresh feed pump, recycle pump, film separation unit and sludge pump, each equipment is connected by pipeline, film pump sump receives the sewage from Aerobic Pond, the sewage of film pump sump enters film separation unit through fresh feed pump and recycle pump, membrane filtration liquid enters anti-pollution reverse osmosis membrane apparatus and processes further, and trapped active sludge intermixture is then got back to anoxic pond and carried out denitrification process or directly discharge;
Described anti-pollution reverse osmosis membrane apparatus comprises feed water by reverse osmosis pump, reverse osmosis charge filter, reverse osmosis high-pressure pump and reverse osmosis units, each equipment is connected by pipeline, the membrane filtration liquid come from inorganic membrane filtration device enters reverse osmosis units through feed water by reverse osmosis pump, reverse osmosis charge filter and reverse osmosis high-pressure pump successively, after reverse-osmosis treated, permeate is directly as circulating cooling Water circulation, a membrane concentration liquid part is used as technique reuse water, a part turns back to equalizing tank circular treatment, remains a small amount of concentrated water discharge.
2. the advanced treatment recovery process of coking chemical waste water according to claim 1, it is characterized in that: described film separation unit comprises multiple separatory membrane group, the sewage of film pump sump enters the first separatory membrane group through fresh feed pump and recycle pump, the concentrated solution of the first separatory membrane group enters the second separatory membrane group, the concentrated solution of the second separatory membrane group enters the 3rd separatory membrane group, the rest may be inferred, and anoxic pond got back to by the concentrated solution of last group separatory membrane group; The membrane filtration liquid of each separatory membrane group then merges and enters anti-pollution reverse osmosis membrane apparatus, or directly as rudimentary Water circulation.
3. the advanced treatment recovery process of coking chemical waste water according to claim 1, is characterized in that: the pore size filter of described mineral membrane controls at 5nm-500nm, and membrane element is tubular type or plank frame, enters film pressure and controls at 1-20kg/cm 2, membrane pressure-controlling is at 0.1-19kg/cm 2, film surface velocity controls at 1-5m/s.
4. the advanced treatment recovery process of coking chemical waste water according to claim 1, is characterized in that: the material of described mineral membrane is selected from aluminium sesquioxide, zirconium dioxide, titanium dioxide, stainless steel, alloy, nickelalloy or silicon carbide.
5. the advanced treatment recovery process of coking chemical waste water according to claim 1, is characterized in that: get back to the control of reflux ratio of the mud that anoxic pond processes further at 0.2-9.
6. the advanced treatment recovery process of coking chemical waste water according to claim 1, is characterized in that: described anti-pollution reverse osmosis membrane is to the interception capacity of sodium-chlor more than 98%, and working pressure controls at 7-40kg/cm 2.
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